i believe the valve stems need to be ground down a smidge, 130lb springs, new retainers, and there is something else that I cant think of that should be done to it. Oh I think the rocker pedistals need to be machined down too, I think thats it, Personally id just run an xp if you are running stock heads. We had a guy in my area run worked heads with the s3 and he grenaded his motor, no wait he nucleared his motor. The work to the heads failed, I dunno if it was the work or the parts failing, but Id rather run some Intense heads wit their bigger cams
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